From patchwork Tue Aug 2 14:32:22 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?UGV0ZXIgV2FuZyAo546L5L+h5Y+LKQ==?= X-Patchwork-Id: 12934718 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7A39CC00140 for ; Tue, 2 Aug 2022 14:33:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237226AbiHBOdx (ORCPT ); Tue, 2 Aug 2022 10:33:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54056 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237315AbiHBOdv (ORCPT ); Tue, 2 Aug 2022 10:33:51 -0400 Received: from mailgw01.mediatek.com (unknown [60.244.123.138]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DA5D815719 for ; Tue, 2 Aug 2022 07:33:49 -0700 (PDT) X-UUID: a050bbf2511d407c9a1605ac0eec858c-20220802 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.8,REQID:af24013f-f376-4eb0-9fa0-60834e385efa,OB:0,LO B:0,IP:0,URL:5,TC:0,Content:-5,EDM:0,RT:0,SF:0,FILE:0,RULE:Release_Ham,ACT ION:release,TS:0 X-CID-META: VersionHash:0f94e32,CLOUDID:3acd06d1-841b-4e95-ad42-8f86e18f54fc,C OID:IGNORED,Recheck:0,SF:nil,TC:nil,Content:0,EDM:-3,IP:nil,URL:1,File:nil ,QS:nil,BEC:nil,COL:0 X-UUID: a050bbf2511d407c9a1605ac0eec858c-20220802 Received: from mtkexhb02.mediatek.inc [(172.21.101.103)] by mailgw01.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 1852328061; Tue, 02 Aug 2022 22:33:41 +0800 Received: from mtkmbs11n1.mediatek.inc (172.21.101.186) by mtkmbs10n1.mediatek.inc (172.21.101.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.792.15; Tue, 2 Aug 2022 22:33:39 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkmbs11n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.792.15 via Frontend Transport; Tue, 2 Aug 2022 22:33:39 +0800 From: To: , , , , , CC: , , , , , , , , , , Subject: [PATCH v3 1/2] ufs: core: introduce a choice of wb toggle during clock scaling Date: Tue, 2 Aug 2022 22:32:22 +0800 Message-ID: <20220802143223.1276-2-peter.wang@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20220802143223.1276-1-peter.wang@mediatek.com> References: <20220802143223.1276-1-peter.wang@mediatek.com> MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Peter Wang Host driver may want to disable/enable write booster during clock scaling. Introduce a flag UFSHCD_CAP_WB_WITH_CLK_SCALING to decouple WB and clock scaling. UFSHCD_CAP_WB_WITH_CLK_SCALING only valid when UFSHCD_CAP_CLK_SCALING is set. Just like UFSHCD_CAP_HIBERN8_WITH_CLK_GATING is valid only when UFSHCD_CAP_CLK_GATING set. Signed-off-by: Peter Wang Reviewed-by: Stanley Chu --- drivers/ufs/core/ufs-sysfs.c | 3 ++- drivers/ufs/core/ufshcd.c | 8 +++++--- include/ufs/ufshcd.h | 7 +++++++ 3 files changed, 14 insertions(+), 4 deletions(-) diff --git a/drivers/ufs/core/ufs-sysfs.c b/drivers/ufs/core/ufs-sysfs.c index 0a088b47d557..8fa1679ffd1a 100644 --- a/drivers/ufs/core/ufs-sysfs.c +++ b/drivers/ufs/core/ufs-sysfs.c @@ -225,7 +225,8 @@ static ssize_t wb_on_store(struct device *dev, struct device_attribute *attr, unsigned int wb_enable; ssize_t res; - if (!ufshcd_is_wb_allowed(hba) || ufshcd_is_clkscaling_supported(hba)) { + if (!ufshcd_is_wb_allowed(hba) || (ufshcd_is_clkscaling_supported(hba) + && ufshcd_can_wb_during_scaling(hba))) { /* * If the platform supports UFSHCD_CAP_CLK_SCALING, turn WB * on/off will be done while clock scaling up/down. diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index 3d367be71728..d86826e958e6 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -1301,9 +1301,11 @@ static int ufshcd_devfreq_scale(struct ufs_hba *hba, bool scale_up) } /* Enable Write Booster if we have scaled up else disable it */ - downgrade_write(&hba->clk_scaling_lock); - is_writelock = false; - ufshcd_wb_toggle(hba, scale_up); + if (ufshcd_can_wb_during_scaling(hba)) { + downgrade_write(&hba->clk_scaling_lock); + is_writelock = false; + ufshcd_wb_toggle(hba, scale_up); + } out_unprepare: ufshcd_clock_scaling_unprepare(hba, is_writelock); diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h index a92271421718..4bd35d68acde 100644 --- a/include/ufs/ufshcd.h +++ b/include/ufs/ufshcd.h @@ -648,6 +648,9 @@ enum ufshcd_caps { * notification if it is supported by the UFS device. */ UFSHCD_CAP_TEMP_NOTIF = 1 << 11, + + /* Allow WB with clk scaling */ + UFSHCD_CAP_WB_WITH_CLK_SCALING = 1 << 12, }; struct ufs_hba_variant_params { @@ -1004,6 +1007,10 @@ static inline bool ufshcd_is_wb_allowed(struct ufs_hba *hba) { return hba->caps & UFSHCD_CAP_WB_EN; } +static inline bool ufshcd_can_wb_during_scaling(struct ufs_hba *hba) +{ + return hba->caps & UFSHCD_CAP_WB_WITH_CLK_SCALING; +} #define ufshcd_writel(hba, val, reg) \ writel((val), (hba)->mmio_base + (reg))